This is not very critical bug, but I thing that it could be work different?
Using keyboard navigation (arrows) causing auto select when change focus to first active element.
- Right Mouse Button click on actor in level (World Outliner)
- Navigate down arrow to “Attach to” (need to press “Enter” to select this option)
- After open submenu, navigate (Arrow down) to select actor, BUT here without using enter → first actor at list is auto “clicked” / selected
- If actor was skeletal mesh, then you can choose bone/socket, nawigate (arrow down), BUT like at “3” → first option (most there is “none”) is selected without using “enter”
Well, hope that steps help You.